//
//  NSString+LSTSHA_1.m
//  23_加密
//
//  Created by dllo on 16/8/16.
//  Copyright © 2016年 LST. All rights reserved.
//

#import "NSString+LSTSHA_1.h"
#import <CommonCrypto/CommonCrypto.h>

@implementation NSString (LSTSHA_1)
- (NSString *)stringwithSHA_1 {
  //1. 将字符串转换成C语言字符串
    const char*cString = [self UTF8String];
   //2. 求长度
    CC_LONG len = (CC_LONG)strlen(cString);
    
    unsigned char bytes[CC_SHA1_DIGEST_LENGTH];
    CC_SHA1(cString, len, bytes);
   // 3.SHA1转换
    NSMutableString *finalSHA1 = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH];
    for (int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) {
        [finalSHA1 appendFormat:@"%02x", bytes[i]];
    }
    return finalSHA1;
}
@end
